<!DOCTYPE html>
<html lang="en">
  
  <head>
    <meta charset="UTF-8">
    <title>Custom Tree Graph</title>
  </head>
  
  <body>
    <div id="mountNode"></div>
    <button id="download">点击下载图片</button>
    <script src="assets/hierarchy.js"></script>
    <script src="../build/g6.js"></script>
    <script src="../build/minimap.js"></script>
    <script src="./assets/jquery-3.2.1.min.js"></script>
    <style>.g6-minimap{ position: absolute; right: 0; bottom: 0; }</style>
    <script>
      const COLLAPSE_ICON = function(x, y, r) {
        return [['M', x, y], ['a', r, r, 0, 1, 0, r * 2, 0], ['a', r, r, 0, 1, 0, -r * 2, 0], ['M', x + 2, y], ['L', x + 2 * r - 2, y]];
      }
      const EXPAND_ICON = function(x, y, r) {
        return [['M', x, y], ['a', r, r, 0, 1, 0, r * 2, 0], ['a', r, r, 0, 1, 0, -r * 2, 0], ['M', x + 2, y], ['L', x + 2 * r - 2, y], ['M', x + r, y - r + 2], ['L', x + r, y + r - 2]]
      };
      G6.registerNode('tree-node', {
        drawShape(cfg, group) {
          const rect = group.addShape('rect', {
            attrs: {
              fill: '#fff',
              stroke: '#666'
            }
          });
          const content = cfg.id.replace(/(.{19})/g, '$1\n');
          const text = group.addShape('text', {
            attrs: {
              text: content,
              x: 0,
              y: 0,
              textAlign: 'left',
              textBaseline: 'middle',
              fill: '#666'
            }
          });
          const bbox = text.getBBox();
          const hasChildren = cfg.children && cfg.children.length > 0;
          if (hasChildren) {
            group.addShape('marker', {
              attrs: {
                x: bbox.maxX + 6,
                y: bbox.minX + bbox.height / 2 - 6,
                r: 6,
                symbol: COLLAPSE_ICON,
                stroke: '#666',
                lineWidth: 2
              },
              className: 'collapse-icon'
            });
          }
          rect.attr({
            x: bbox.minX - 4,
            y: bbox.minY - 6,
            width: bbox.width + (hasChildren ? 26 : 8),
            height: bbox.height + 12
          });
          return rect;
        }
      },
      'single-shape');
      const minimap = new Minimap({
        size: [200, 150],
        type: 'delegate',
        delegateStyle: {
          fill: '#fff',
          stroke: '#666'
        }
      });
      const graph = new G6.TreeGraph({
        container: 'mountNode',
        width: 800,
        height: 600,
        plugins: [minimap],
        modes: {
          default: [{
            type:
            'collapse-expand',
            onChange(item, collapsed) {
              const icon = item.get('group').findByClassName('collapse-icon');
              if (collapsed) {
                icon.attr('symbol', EXPAND_ICON);
              } else {
                icon.attr('symbol', COLLAPSE_ICON);
              }
            }
          },
          'drag-canvas', 'zoom-canvas']
        },
        defaultNode: {
          shape: 'tree-node',
          anchorPoints: [[0, 0.5], [1, 0.5]],
        },
        defaultEdge: {
          shape: 'cubic-horizontal',
          style: {
            stroke:
            '#A3B1BF'
          }
        },
        layout: data => {
          return Hierarchy.compactBox(data, {
            direction: 'LR',
            getId(d) {
              return d.id;
            },
            getHeight() {
              return 16;
            },
            getWidth() {
              return 16;
            },
            getVGap() {
              return 20;
            },
            getHGap() {
              return 80;
            }
          });
        }
      });
      $.getJSON('./assets/data/modeling-methods.json', data => {
        graph.data(data);
        graph.render();
        graph.fitView();
      });
      document.getElementById('download').addEventListener('click', () => {
        graph.downloadImage();
      });
    </script>
  </body>

</html>